The Apple Watch Ultra 3 is a significant upgrade to Apple's most rugged smartwatch, featuring a larger and brighter display with a peak brightness of 3000 nits, making it the brightest Apple Watch display to date. It boasts up to 42 hours of battery life with normal use and can extend to around 72 hours with Low Power Mode, supporting fast charging that provides 8 hours of usage from 15 minutes of charging. The watch includes advanced satellite connectivity for off-the-grid communication, 5G support, and continues with its durable titanium design made from 100% recycled material. Additionally, it supports new health features like Hypertension Notifications and an enhanced Sleep Score. Overall, the Ultra 3 is praised for its battery life, improved display, and satellite functions, making it a powerhouse smartwatch for outdoor and safety-conscious users, though it is recognized as an incremental upgrade over the Ultra 2.